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50 | Installation schemes
8 .3
Cascade
The SSB boilers can be connected together to form a cascade with a
maximum of 16 boilers. In this case, one boiler will be the manager of the
other boilers connected. This boiler is named "Primary". The other one(s)
are named "Secondary".
To have a cascade it is necessary to connect together the boilers using
the "Cascade link" (pin 1-2) in parallel as shown in the following figure:
Boiler 1
CASCADE
MOD
Gas
LINK
BUS
Switch
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Boiler 2
CASCADE
LINK
1 2 3
Fig. 79
To define the "Primary" boiler of the cascade set to "ON" the "S4 switch".
This switch has to be set "OFF" in all the "Secondary" boilers (see the
following figure).
Fig. 80
CAUTION: Change the position of the S4 switch only when
a
the boiler is off.
6720818456 (2018/06) US
Out
DHW Tank
Room
Supply
Door
Sensor
Thermostat
Sensor
...
Boiler 16
CASCADE
LINK
1 2 3
O N
O F
F
Each cascade boiler has to be identified by an address (parameter N° 73
"Boiler Address" )different from the others. To define these address follow
the steps below:
► Switch on the "Primary boiler" and set the parameter N°73 ("Boiler
Address") to 1
► Switch off the "Primary boiler"
► Switch on the second boiler and set the parameter N°73 to 2.
► Switch off the second boiler
► Continue with steps 3 and 4 for each boiler (each "Secondary" boiler
has to be a different number from 2 to 16 and the "Primary" must be
number 1)
► Switch on all boilers starting with the "Primary boiler"
SSB
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